Learn Italian: Noi osserviamo tutte le tigri feroci. - We observe all the fierce tigers.

In Italian, when you use a form of tutto to mean all of a specific group, you must include the definite article right after it. Therefore, you always say tutte le (all the) before the noun.

Wait, tigri ends in -i. Why does it take the feminine words tutte and le?

The singular noun is la tigre (the tiger). In Italian, nouns that end in -e in the singular change their ending to -i in the plural, regardless of whether they are masculine or feminine. Since tigre is a feminine noun, its plural tigri requires the feminine plural modifiers tutte and le.

Why does the adjective feroci end in -i if it's describing a feminine noun?

The singular adjective is feroce (fierce). Adjectives that end in -e in the singular form their plural by changing to -i, for both masculine and feminine nouns alike. Since tigri is plural, the adjective becomes feroci.

Do I have to include Noi at the beginning of the sentence?